In Virginia, there is an agency bearing the bland name of Technical Operations Support Activity, or TOSA. Its one mission is to track, find, and kill those so dangerous to the United States that they are on a short document known as the Kill List. Added to it is a terrorist of frightening effectiveness called the Preacher, who radicalizes young Muslims abroad to carry out assassinations. Unfortunately for him, one of the kills is a retired Marine general, whose son is TOSA's top hunter of men.